Fix error message on untrusted domain error page
Fix error message on untrusted domain error page

Fixes #5347

Signed-off-by: Morris Jobke <7f550a9f4c44173a37664d938f1355f0f92a47a7@morrisjobke.de>

andreas-p/nextcloud-server,michaelletzgus/nextcloud-server,nextcloud/server,nextcloud/server,michaelletzgus/nextcloud-server,andreas-p/nextcloud-server,andreas-p/nextcloud-server,michaelletzgus/nextcloud-server,nextcloud/server,andreas-p/nextcloud-server,michaelletzgus/nextcloud-server,nextcloud/server,andreas-p/nextcloud-server